Pivot-pin for couplings.



No. 735,000. PATENTED JULY 28, 1903. G. A. TOWER. PIVOT PIN FOR COUPLINGS APPLICATION IVILED JAN. 21. 1903 no MODEL.

INVENTO R cams vz'rzag co, muvomnm nmoron n c WITNESSES UNITED STATES Patented July 28, 1903.

PATENT OFFICE.

CLINTON A. TOWER, OF CLEVELAND, OHIO.

SPECIFICATION forming part of Letters Patent No. 735,000, dated July 28, 1903.

Application filed January 21, 1903. Serial No. 139,958. (No model.)

To all whom it may concern:

Be it known that I, CLINTON A. TOWER, of Cleveland, Cuyahoga county, Ohio, have invented a new and useful Pivot-Pin for Couplers, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, forming part of this specification, in which Figure 1 is a top plan view of a coupler, showing the ear, pin, and knuckle in full lines. Fig. 2 is a vertical section on the line II II of Fig. 1.

The purpose of my invention is to provide means for preventing the loss of the pivotpin of a coupler-knuckle in case the pin should break. It also enables the pin to be made without a head, which is desirable because the heating of a steel pin, which is necessary in order that the head may be upset, is apt to injure the steel, and thus render the pin weak.

As shown in the drawings, I cast the coupler-head 2 with a pivot-pin hole 3, extending Vertically at the outer forked end of the head and adapted to receive the pin 4, which is a straight headless piece of metal and constitutes a pivot for the coupling-knuckle. The lower end of the hole at 5 is of less diameter than the pin, so that a shoulder 6 is afiorded in the hole on which the end of the pin rests and by which it is prevented from dropping through the hole, while the extension 5 of reduced diameter permits access to the hole when it is desired to remove the pin. Above the shoulder 6 the hole is cast with an enlarged portion 7. This is of importance because it enablesa drifting-tool to be forced down through the hole after the coupler is cast in order to broach the hole, the enlargement 7 afiording a cavity into which the metal dislodged by the drifting-tool can fall. When the knuckle is applied to the coupler, the pin 4 is set in the hole through the coupler and knuckle, the lower end of the pin resting on the shoulder 6 and the upper end being about flush with or below the surface of the coupler. It may then be held from working up by a cotter or rivet 8, which fits in a lug 9 on the coupler and extends over the pin.

If the pin should break, it is held by the shoulder 6 from dropping from the hole.

I claim l. A coupler having a pivot-pin hole with a supporting-shoulder at its lower end and an enlargement above the shoulder; substantially as described.

2. A coupler having a pivot-pin hole with a shoulder at its lower end and an enlargement above the shoulder, said hole having a reduced portion below the shoulder; substantially as described.

-3. A coupler having a pivot-pin hole with a shoulder at its lower end on which the end of the pin rests, in combination with a headless pin' having its upper end at or below the surface of the coupler, and a device on the coupler above the pin by which it is retained; substantially as described.

In testimony whereof I 'have hereunto set 70 my hand.

CLINTON A. TOWER.

Witnesses:

D. W. CALL, E. W. WHITTEMORE. 

